Pressure regulator and piston



FIG. 1 is a top perspective view of a pressure regulator and piston according to the invention;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is a top view thereof;

FIG. 7. is a bottom view thereof; and,

FIG. 8 is a bottom perspective view thereof.

In the drawings, the dash/dot/dot/dash broken lines depict claim boundaries and form no part of the claim; the evenly spaced broken lines illustrate portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a pressure regulator and piston, as shown and described. 